Obama’s veto threat comes on the heels of an epic fight in Congress at the end of last year, when the Senate narrowly defeated a bill to build the pipeline.

We’ve written recently that the plummet in oil prices weakened the case for Keystone XL. But today’s veto threat is about more than falling oil prices. This monumental victory couldn’t have been won without activists like you. You helped us make so much noise that Keystone XL became a political non-starter. Some highlights from the fight:

March 2014: Over 1,200 students protested and 398 were arrested at the White House fence, in an action organized by 350.org

Several hundred students and youth who marched from Georgetown University to the White House to protest the Keystone XL Pipeline tied themselves to the fence outside the White House in Washington, Sunday, March 2, 2014. Many of those protesting were arrested. (AP Photo/Susan Walsh)

April 2014: Bold Nebraska, Idle No More, 350.org, Sierra Club, Other98 and many others, supported an unprecedented Cowboy-Indian Alliance opposing the Keystone XL on the National Mall, and used a giant light cannon to project hundreds of your anti-KXL messages onto the EPA building in DC

Summer 2014: Scores of Climate Justice groups, including Other98 helped provide trainings and do outreach for the biggest climate march the world has ever seen, with more than 400,000 taking the streets in NYC alone.

While now is a time for celebration, there is still work to be done. Help make sure Keystone XL is rejected, once and for all. Call the President to tell him “Thank You” for his veto threat: (202) 456-1111, or send him an email to do the same.